Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c8d386540e5e27…

MALICIOUS

PDF

83.8 KB Created: 2021-05-01 04:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 183c40893128e054b4bf5cd7dfb0f56b SHA-1: 82a9d3e5d3e03d9ae5d8c16f3ef74545a867b802 SHA-256: 52c8d386540e5e27036bbdb15efca2b64ee3941f10e6646616da0081a38aeda8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'The Stand series 2020' and the wkhtmltopdf application, likely a lure to disguise the malicious intent of redirecting users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=the+stand+series+2020+where+to+watch PDF link annotation
    • http://loberas.22web.org/probability_examples_with_solutions.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/stanley_bc15bs_review.pdfIn PDF document text
    • http://baxogujefavug.iblogger.org/85911156484.pdfIn PDF document text
    • http://sokegex.mywebcommunity.org/admirvel_mundo_novo_huxley.pdfIn PDF document text
    • http://rowokalasi.iblogger.org/satevumemasi.pdfIn PDF document text
    • http://vazagitomis.mypressonline.com/79728917024.pdfIn PDF document text
    • http://kogiwonewaveg.iblogger.org/38455723493.pdfIn PDF document text
    • http://dotenipago.medianewsonline.com/bcs_written_book_download.pdfIn PDF document text
    • http://fomizedo.iblogger.org/love_story_movie_old_hindi_cast.pdfIn PDF document text
    • http://vabodulesofife.22web.org/flotec_sprinkler_pump_home_depot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_ddf77346976c4211a5c72964e9631824.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f4815f-c591-4271-9a1f-b67352f6c82d/mizuridigonelojasakugewo.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_6470320319ee42dc866cfb762c480dfb.pdf?index=trueIn PDF document text
    • http://vateden.epizy.com/kai_sa_mid_lane_guide.pdfIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_61b63123fc584e5087a7c9d5b3cbfc59.pdf?index=trueIn PDF document text
    • http://rudufegasavu.rf.gd/keurig_model_k40_owners_manual.pdfIn PDF document text
    • https://a7563df4-ba19-4d82-a8a0-b2470d957038.filesusr.com/ugd/61f964_c45b9d9720194b7fbe371a5b664a52b0.pdf?index=trueIn PDF document text
    • http://zebideru.rf.gd/sitewumetub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c224ea-1da1-4fc2-a1d0-fb7eff029377/whats_better_mink_or_russian_lashes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0f57b45-ae79-4c9b-bad0-e431fb231ba8/somnus_dreadwood_ebay.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA9 5096 bytes
SHA-256: 1f4fb704591fd6eef8a68be4ed0ced847f5a44e1fda6a13a748cb3ea4095f2c1
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 11512 bytes
SHA-256: 322e99035a0fdc7a5bae6aa71a46bcb04cc871d6338931914978b726c0e77ef9
font_02_sfnt_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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